package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {

        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

        // 判断商品是否存在于购物车 通过userId和商品Id去判断
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        // 已经存在则数量+1
        if (list != null && !list.isEmpty()) {
            list.get(0).setNumber(list.get(0).getNumber() + 1);
            shoppingCartMapper.updateNumberById(list.get(0));
        }
        // 不存在则新增
        else {
            Long dishId = shoppingCartDTO.getDishId();
            Long setmealId = shoppingCartDTO.getSetmealId();
            if (dishId != null) {
                // 本次添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            } else {
                // 本次添加到购物车的是套餐
                Setmeal setmeal = setmealMapper.getSetmealById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());

            shoppingCartMapper.insert(shoppingCart);
        }


    }

    @Override
    public List<ShoppingCart> list(ShoppingCart cart) {
        return shoppingCartMapper.list(cart);

    }

    @Override
    public void clean(Long userId) {
        shoppingCartMapper.clean(userId);
    }

    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

        // 判断商品是否存在于购物车 通过userId和商品Id去判断
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        // 已经存在则数量-1
        if (CollectionUtils.isEmpty(list)) {
            return;
        }
        if (list.get(0).getNumber() > 1) {
            list.get(0).setNumber(list.get(0).getNumber() - 1);
            shoppingCartMapper.updateNumberById(list.get(0));
        } else {
            shoppingCartMapper.removeById(list.get(0).getId());
        }
    }
}
